Hey! This is my first REAL serious year of Robotics so I was looking at a 4-bar lift then having a extension lift as the ‘claw’ then i was going to have a flipper that turns the caps instead of throwing it up. I also want to know if this is a good idea. I was curious on how to execute this idea, we don’t have any AutoCAD or program that allows us to build our robot digitally, and I would rather have a website powerpoint or youtube video.
Our school does block certain websites and videos.
Really, you just build it and see if it works. You should mock it up loosely first to save time, though.
I’m not sure what you mean by “extension lift.”
And on your 4-bar, mounting the joints closer together can help you get more vertical reach at the expense of needing moderately more torque.
I would suggest just making a prototype first and getting proof your concepts are realistic and working. From that point you can re-design it or continue building. On a side note, if your school doesnt block safeshare.tv you can you this website to make watchable versions of any youtube video. Its a free and great website that just requires the blocked videos link to work.
That seems more complicated and heavy than its worth. If your original lift goes high enough, you won’t need to further extend it. A cool idea, but for the sole purpose discussed, I don’t think it’s worth it.
Also, I don’t know that a single 4 bar would be high enough to reach the uppermost post. Can anyone confirm?
But, really. An extension on your lift isn’t a bad idea, but you’d need to put some serious thought into how to not make it too complicated. A simple DR4B might be easier than what you’re describing.
If you really want to look into extending your lift via a subsystem, we can look at that. I had a couple of ideas last year I just never built because I was too busy. If there’s any interest, I can see about mocking it up.
The top of the cap on the tallest post is 36”. That means that the 4 bar would have to literally double the robot’s height. It’s easily not impossible.
Alas, it may not be the most space efficient. I put some thought into what the best extension lift would be for this application. It would have to add nearly nothing to the lift weight for the sake of motor power. And it would be nice if it were passive.
I designed a box-and-tackle type system last year driven by the movement of arms. I didn’t have to use it, but it was actually pretty cool in testing.
You would have a rope attached to the robto’s base somewhere. It would take a bit of testing to find the best spot. The rope would then go up and over a pulley attached to the top of the moving section of the 4 bar. It would be connected to the manipulator. The manipulator would be on a vertical slide. As the lift raised, the rope would get shorter, thusly “pulling” on the manipulator to move it up the vertical slide. You would end up with your manipulator at the top of the moving 4 bar linkage instead of at the bottom. I can draw pictures if this isn’t making any sense.
yeah, i wanted to make one of these but i dont know how to go about making it, there arnt any videos on like or website pdfs that i can look at to build that i could find. If there was some can you give them to me?
I don’t have one yet on my robot, but I found a good YouTube video.
Attached is a useful screenshot. I can build one from IQ pieces tonight if I have time. I’m sure you can find other forum posts with more helpful pictures. YOu can also try and build one and then ask for specific help on the forum.
@CHS_Carter I’m building my first DR4B (at least I think that’s what it is) right now, and I just got the mobile tower half-installed and able to work. It’s relatively simply and clear-cut, so if you want any pictures just let me know. I don’t really think that it’ll reach the 36" post, but I have yet to test it or do any of the maths to figure it out. I also made it out of aluminum, so it’s super light.
I suspect we’ll also have problems with sticking it on the robot and finding a good intake and flipping method for it…we have a super weird chassis. I’ll give an update if something goes wrong…
That is a huge discussion around other threads. The General concensus agrees with you, but there are still plenty of really good cap bots that outcycle some descorers. An example is TVAConnor’s robot.
@Got a Screw Loose
Here’s the chassis as it is now, we just tested it and will probably replace the front wheels with rubber traction wheels. It’s based off of 1814D’s early-season prototype and a picture from Wikipedia xD
When that happens, it should be able to climb the center platform from the side, and not the alliance platforms.
Sorry that took more than a few minutes lol
